Device for crimping explosive caps.



J. M. JACKSON.

DEVICE FOR GRIMPING BXPLOSIVE GAPS.

APPLICATION FILED JULY 7,1909.

954,297, Patented Apr. 5, 1910.

JL E.

' INVENTOR.

k/ Mk/ac/rson JAMES JIAGKSON, 01? DENVER, COLORADO.

DEVICE FOR OBIMPING EXPLOSIVE OAIPS.

Specification of Letters l'atent.

Application filed July 7, 1909. Serial N0. 506,280.

To all whom it mivy concern:

Be it known that I, JAMES M. JAoKsoN, citizen of the United States of America, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in De- -vices for Crimping Explosive Caps, of

operation is completed.

which the followin is a specification.

This invention re ates to improvements in crimpin devices of the class employed to secure t e ca by which acharge of explosive matter 1s ignited in blasting roclr for mining and construction purposes, to' the combustible fuse.

The object of my invention resides in the provision of a simple device by which the cap is firmly secured in lace upon the end of the fuse, and by whic the joint between the two is rendered watertight so as to pro tect tlie fulminating substance contained in the cap, from moisture without the use of soap, tar or other similar substance commonly employed for that purpose. I provide, to this end, a device composed of two pivotally connected members, the jaws of which are constructed to engage the circumferential surface ofthe cap so as to double the metalof which it is com osed in two folds which project tangential y to the said .surface and are, by a second step in the operation, bent in conformity therewith.

In the accompanying drawings, in the various views of which like parts are similarly designated Figure 1 represents the de vice with its jaws in the 0 en position, Fig. 2, an edge view thereof, l i 3, a view showing the closed position 0 the jaws, drawn to an exaggerated scale, Fig.4, a similar view showing the fuse and cap in position between the jaws after the first step in the operation is performed, Fig. 5, a cross-sectionalview of the fuse and the cap after having been subjected to the second step in the o eration drawn to a greatly exa gerated scale and 6, a side view 0 the fuse and cap a r the device, as shown I embers5 and 6, pivote together by mean of agrivet 7 or analogous means'and each comprising The improved crimping a handle and a jaw. The jaw B of the'mern lv b611 5 is formed in its inner edge with a coral paratively deep transverse groove g), the parallel sides 9" of which terminate in a semiential surface tongue a circular end-surface 9% Ihe opposite jaw I Patented Apr. 5, 1 910.

position, which is determined by the engagement of shoulders 9 at opposite sides of the tongue 12 with the inner edge of the jaw 8, the tongue projects axially into the groove 9, and the distance between their ends 1s substantiallv equal to the diameter of the fuse upon w ose extremity the cap is to be crimped.

In the operation which, as mentioned hereinbefore, is preferably performed in two steps, theend of the fuse 13 is inserted into the ca 14 and the open extremity of the lat ter p ace between the jaws 8 and 10 as shown in Fig. 4 of the drawings. When the jaws are brought together by pressure exerted upon the handles of the two members, the surplus metal of the cap ,whose diameter exceeds that of the fuse is doubled into two folds 15, which when the pleted, project into the spaces, between the parallel sides of the groove 9 and the ton no 12, in tangential relation to the circum erential surface of the cap. In the second step of the operation, the fuse and cap are turned through an arc of about ninety de ees so that when the two jaws are again 'rought together their arcuate end surfaces engage the fol s 15, which in consequence are squeezed in conformity with the circumferof the cap. This completes the operation and the joint produced as shown, exaggerated, in Fig. 5, not only secures the cap firmly upon the fuse, but will exclude moisture from the interior of the substance with which it is charged.

Having thus described my invention what I claim and desire to secure by Letters'Pateat is 1. A device of the'class named comprising two cooperatively connected jaws formed at their inner edges respectively with a tongue and with a oove of reater width than said arrange to receive the same when the jawsare '1n\the closed. os tlon.

.2. A device of the class name comprisin two cotiperatively connected 'aws one c which has a groove and the ot er a ton e. projecting into said groove in spaced relation .former, and thus protects the fulminating to its sides, when the jaws are in the closed position.

3. A device of the class named comprisin two cooperatively connected jaws one 0 which has a groove whose substantiall rectilinear sides terminate in a semi-circu ar end surface, and thei'other a tongue having in its end an ancuate depression and projectin into 'said groove -in spaced'relation to sai sides and said end surface, when the jaws are in the closed position.

4. A device of the class named coihprisin two cooperativel connected we, the close position of whic is determined by the enga ment of theirinner e es, one of the sai 'aws having a groove 'm its engaging ed 0 and the other a tongue projecting into and groove in spaced relation to its sides.

into said groov 5. A device of the class named comprisin two cooperatively connected jaws one 0 which has 'a oove the substantially rectilinear sides 0 which terminate in a semicircular end surface, and the other a tongue having in its end, an arcu'ate de resslon whose radius, is approximately equal of said end surface, said tongue proiecting e sides, and at a distance from said surface substantially equal to its diameter, when the jaws are in. the closed position.

lnltestimony whereof I have aflixed my signature in presence of two witnesses.

I JAMES M, JACKSON. Witnesses: v

G. J. RoLLANoE'r', M. L. GEABY.

to thatin spaced relation to its 

